User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0

Steps to reproduce:

1. Switch to Wayland;
2. Right click on the page or use on the bookmark items.

This doesn't apply to the hamburguer context menu for example.

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Is that KDE/Plasma/Wayland? If so which version do you run?
Please attach content of about:support.

Ops, I forgot:
Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-17-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × Intel® Core™ i5-8265U CPU @ 1.60GHz
Memory: 15,5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620

Name: Firefox
Version: 88.0.1
Build ID: 20210506181554
Distribution ID:
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0
OS: Linux 5.11.21-179.current #1 SMP PREEMPT Sat May 15 13:51:49 UTC 2021
Multiprocess Windows: 1/1
Fission Windows: 0/1 Disabled by default
Remote Processes: 10
Enterprise Policies: Inactive
Google Location Service Key: Missing
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

Should I paste everything from about:support? Does it contains sensitive data?

Correction: in the "Graphics Platform: X11", the correct is Wayland (is that I'm using X now because of this bug).

Dup of https://bugzilla.mozilla.org/show_bug.cgi?id=1693472 ?

This should be fixed by new SW multibuffer backend available in Firefox 92/93.